The Australian tree dropped from aeroplanes over Florida's Everglades that spread across nearly 500,000 acres

In 1936, a Florida landowner scattered melaleuca seeds from an aeroplane over the eastern edge of the Everglades, part of a deliberate, decades-long effort to dry out what was then widely viewed as unusable swampland and turn it into farmable ground. The tree, a fast-growing Australian species known as the paperbark, seemed perfectly suited to the task, since its roots draw up large volumes of water and release it through its leaves.

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